The victim remained conscious after the shooting and was taken to Oslo University Hospital for treatment.
He is believed to be one of the leaders of a motorcycle club that includes former members of the Outlaws and Hells Angels, TV 2 reports.
“He hasn’t said anything about any potential perpetrators. He says he didn’t see anything and doesn’t know who could be behind this,” said police spokesman Bjørn Jahr.
Police had not made any arrests by 8am.
“He was shot between 6 and 6.15, so the chances of finding someone now are very slim,” said Jahr.
Police were alerted to the shooting at 6.45am. When police arrived at the man’s house in Kurland, he explained he had been shot on the way out to his car.
“He appears to have been hit with a shot in the hip or back. That much he has told us, but he hasn’t been able to give us any information about who might have shot him,” said Jahr.
Police are appealing for assistance from anybody who may have been in the area at the time of the shooting.